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[209.85.218.50]) by smtp.gmail.com with ESMTPSA id b5-20020a1709062b4500b0099297782aa9sm244049ejg.49.2023.10.17.11.38.37 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Oct 2023 11:38:37 -0700 (PDT) Received: by mail-ej1-f50.google.com with SMTP id a640c23a62f3a-9936b3d0286so975552566b.0 for ; Tue, 17 Oct 2023 11:38:37 -0700 (PDT) X-Received: by 2002:a17:906:4fc7:b0:9b2:b149:b81a with SMTP id i7-20020a1709064fc700b009b2b149b81amr2302073ejw.64.1697567917353; Tue, 17 Oct 2023 11:38:37 -0700 (PDT) MIME-Version: 1.0 References: <20231016143828.647848-1-jeffxu@chromium.org> <55960.1697566804@cvs.openbsd.org> In-Reply-To: <55960.1697566804@cvs.openbsd.org> From: Linus Torvalds Date: Tue, 17 Oct 2023 11:38:19 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [RFC PATCH v1 0/8] Introduce mseal() syscall To: Theo de Raadt Cc: Jeff Xu , jeffxu@chromium.org, akpm@linux-foundation.org, keescook@chromium.org, sroettger@google.com, jorgelo@chromium.org, groeck@chromium.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, jannh@google.com, surenb@google.com, alex.sierra@amd.com, apopple@nvidia.com, aneesh.kumar@linux.ibm.com, axelrasmussen@google.com, ben@decadent.org.uk, catalin.marinas@arm.com, david@redhat.com, dwmw@amazon.co.uk, ying.huang@intel.com, hughd@google.com, joey.gouly@arm.com, corbet@lwn.net, wangkefeng.wang@huawei.com, Liam.Howlett@oracle.com, lstoakes@gmail.com, willy@infradead.org, mawupeng1@huawei.com, linmiaohe@huawei.com, namit@vmware.com, peterx@redhat.com, peterz@infradead.org, ryan.roberts@arm.com, shr@devkernel.io, vbabka@suse.cz, xiujianfeng@huawei.com, yu.ma@intel.com, zhangpeng362@huawei.com, dave.hansen@intel.com, luto@kernel.org, linux-hardening@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: AE4AFC001C X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: pbc6dxy9iwnnnhpbkyggf5u15t9g7sir X-HE-Tag: 1697567920-827979 X-HE-Meta: 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 QCMNElgm 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, 17 Oct 2023 at 11:20, Theo de Raadt wrote: > > The only case where the immutable marker is ignored is during address space > teardown as a result of process termination. .. and presumably also execve()? I do like us starting with just "mimmutable()", since it already exists. Particularly if chrome already knows how to use it. Maybe add a flag field (require it to be zero initially) just to allow any future expansion. Maybe the chrome team has *wanted* to have some finer granularity thing and currently doesn't use mimmutable() in some case? Linus